4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright (c) 2018 by Delphix. All rights reserved.
24 * Copyright (c) 2018 Datto Inc.
27 #include <sys/dataset_kstats.h>
28 #include <sys/dmu_objset.h>
29 #include <sys/dsl_dataset.h>
32 static dataset_kstat_values_t empty_dataset_kstats = {
33 { "dataset_name", KSTAT_DATA_STRING },
34 { "writes", KSTAT_DATA_UINT64 },
35 { "nwritten", KSTAT_DATA_UINT64 },
36 { "reads", KSTAT_DATA_UINT64 },
37 { "nread", KSTAT_DATA_UINT64 },
38 { "nunlinks", KSTAT_DATA_UINT64 },
39 { "nunlinked", KSTAT_DATA_UINT64 },
41 { "zil_commit_count", KSTAT_DATA_UINT64 },
42 { "zil_commit_writer_count", KSTAT_DATA_UINT64 },
43 { "zil_itx_count", KSTAT_DATA_UINT64 },
44 { "zil_itx_indirect_count", KSTAT_DATA_UINT64 },
45 { "zil_itx_indirect_bytes", KSTAT_DATA_UINT64 },
46 { "zil_itx_copied_count", KSTAT_DATA_UINT64 },
47 { "zil_itx_copied_bytes", KSTAT_DATA_UINT64 },
48 { "zil_itx_needcopy_count", KSTAT_DATA_UINT64 },
49 { "zil_itx_needcopy_bytes", KSTAT_DATA_UINT64 },
50 { "zil_itx_metaslab_normal_count", KSTAT_DATA_UINT64 },
51 { "zil_itx_metaslab_normal_bytes", KSTAT_DATA_UINT64 },
52 { "zil_itx_metaslab_slog_count", KSTAT_DATA_UINT64 },
53 { "zil_itx_metaslab_slog_bytes", KSTAT_DATA_UINT64 }
58 dataset_kstats_update(kstat_t *ksp, int rw)
60 dataset_kstats_t *dk = ksp->ks_private;
61 dataset_kstat_values_t *dkv = ksp->ks_data;
62 ASSERT3P(dk->dk_kstats->ks_data, ==, dkv);
64 if (rw == KSTAT_WRITE)
67 dkv->dkv_writes.value.ui64 =
68 wmsum_value(&dk->dk_sums.dss_writes);
69 dkv->dkv_nwritten.value.ui64 =
70 wmsum_value(&dk->dk_sums.dss_nwritten);
71 dkv->dkv_reads.value.ui64 =
72 wmsum_value(&dk->dk_sums.dss_reads);
73 dkv->dkv_nread.value.ui64 =
74 wmsum_value(&dk->dk_sums.dss_nread);
75 dkv->dkv_nunlinks.value.ui64 =
76 wmsum_value(&dk->dk_sums.dss_nunlinks);
77 dkv->dkv_nunlinked.value.ui64 =
78 wmsum_value(&dk->dk_sums.dss_nunlinked);
80 zil_kstat_values_update(&dkv->dkv_zil_stats, &dk->dk_zil_sums);
86 dataset_kstats_create(dataset_kstats_t *dk, objset_t *objset)
89 * There should not be anything wrong with having kstats for
90 * snapshots. Since we are not sure how useful they would be
91 * though nor how much their memory overhead would matter in
92 * a filesystem with many snapshots, we skip them for now.
94 if (dmu_objset_is_snapshot(objset))
98 * At the time of this writing, KSTAT_STRLEN is 255 in Linux,
99 * and the spa_name can theoretically be up to 256 characters.
100 * In reality though the spa_name can be 240 characters max
101 * [see origin directory name check in pool_namecheck()]. Thus,
102 * the naming scheme for the module name below should not cause
103 * any truncations. In the event that a truncation does happen
104 * though, due to some future change, we silently skip creating
105 * the kstat and log the event.
107 char kstat_module_name[KSTAT_STRLEN];
108 int n = snprintf(kstat_module_name, sizeof (kstat_module_name),
109 "zfs/%s", spa_name(dmu_objset_spa(objset)));
111 zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
112 " snprintf() for kstat module name returned %d",
113 (unsigned long long)dmu_objset_id(objset), n);
114 return (SET_ERROR(EINVAL));
115 } else if (n >= KSTAT_STRLEN) {
116 zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
117 "kstat module name length (%d) exceeds limit (%d)",
118 (unsigned long long)dmu_objset_id(objset),
120 return (SET_ERROR(ENAMETOOLONG));
123 char kstat_name[KSTAT_STRLEN];
124 n = snprintf(kstat_name, sizeof (kstat_name), "objset-0x%llx",
125 (unsigned long long)dmu_objset_id(objset));
127 zfs_dbgmsg("failed to create dataset kstat for objset %lld: "
128 " snprintf() for kstat name returned %d",
129 (unsigned long long)dmu_objset_id(objset), n);
130 return (SET_ERROR(EINVAL));
132 ASSERT3U(n, <, KSTAT_STRLEN);
134 kstat_t *kstat = kstat_create(kstat_module_name, 0, kstat_name,
135 "dataset", KSTAT_TYPE_NAMED,
136 sizeof (empty_dataset_kstats) / sizeof (kstat_named_t),
139 return (SET_ERROR(ENOMEM));
141 dataset_kstat_values_t *dk_kstats =
142 kmem_alloc(sizeof (empty_dataset_kstats), KM_SLEEP);
143 memcpy(dk_kstats, &empty_dataset_kstats,
144 sizeof (empty_dataset_kstats));
146 char *ds_name = kmem_zalloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
147 dsl_dataset_name(objset->os_dsl_dataset, ds_name);
148 KSTAT_NAMED_STR_PTR(&dk_kstats->dkv_ds_name) = ds_name;
149 KSTAT_NAMED_STR_BUFLEN(&dk_kstats->dkv_ds_name) =
150 ZFS_MAX_DATASET_NAME_LEN;
152 kstat->ks_data = dk_kstats;
153 kstat->ks_update = dataset_kstats_update;
154 kstat->ks_private = dk;
155 kstat->ks_data_size += ZFS_MAX_DATASET_NAME_LEN;
157 wmsum_init(&dk->dk_sums.dss_writes, 0);
158 wmsum_init(&dk->dk_sums.dss_nwritten, 0);
159 wmsum_init(&dk->dk_sums.dss_reads, 0);
160 wmsum_init(&dk->dk_sums.dss_nread, 0);
161 wmsum_init(&dk->dk_sums.dss_nunlinks, 0);
162 wmsum_init(&dk->dk_sums.dss_nunlinked, 0);
163 zil_sums_init(&dk->dk_zil_sums);
165 dk->dk_kstats = kstat;
166 kstat_install(kstat);
171 dataset_kstats_destroy(dataset_kstats_t *dk)
173 if (dk->dk_kstats == NULL)
176 dataset_kstat_values_t *dkv = dk->dk_kstats->ks_data;
177 kstat_delete(dk->dk_kstats);
178 dk->dk_kstats = NULL;
179 kmem_free(KSTAT_NAMED_STR_PTR(&dkv->dkv_ds_name),
180 KSTAT_NAMED_STR_BUFLEN(&dkv->dkv_ds_name));
181 kmem_free(dkv, sizeof (empty_dataset_kstats));
183 wmsum_fini(&dk->dk_sums.dss_writes);
184 wmsum_fini(&dk->dk_sums.dss_nwritten);
185 wmsum_fini(&dk->dk_sums.dss_reads);
186 wmsum_fini(&dk->dk_sums.dss_nread);
187 wmsum_fini(&dk->dk_sums.dss_nunlinks);
188 wmsum_fini(&dk->dk_sums.dss_nunlinked);
189 zil_sums_fini(&dk->dk_zil_sums);
193 dataset_kstats_update_write_kstats(dataset_kstats_t *dk,
196 ASSERT3S(nwritten, >=, 0);
198 if (dk->dk_kstats == NULL)
201 wmsum_add(&dk->dk_sums.dss_writes, 1);
202 wmsum_add(&dk->dk_sums.dss_nwritten, nwritten);
206 dataset_kstats_update_read_kstats(dataset_kstats_t *dk,
209 ASSERT3S(nread, >=, 0);
211 if (dk->dk_kstats == NULL)
214 wmsum_add(&dk->dk_sums.dss_reads, 1);
215 wmsum_add(&dk->dk_sums.dss_nread, nread);
219 dataset_kstats_update_nunlinks_kstat(dataset_kstats_t *dk, int64_t delta)
221 if (dk->dk_kstats == NULL)
224 wmsum_add(&dk->dk_sums.dss_nunlinks, delta);
228 dataset_kstats_update_nunlinked_kstat(dataset_kstats_t *dk, int64_t delta)
230 if (dk->dk_kstats == NULL)
233 wmsum_add(&dk->dk_sums.dss_nunlinked, delta);